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Este estudo relaciona atividade física (AF), aptidão física (AptF), maturação biológica e "status" socioe-conômico (ESE) com as prevalências de risco ponderal de adolescentes. Foi desenvolvido no Concelho de Santo Tirso, região norte de Portugal e amostrou 961 alunos (463 meninos e 498 meninas) com idades variando entre os 11 e os 18 anos. O índice de massa corporal foi utilizado para estabelecer o "status" ponderal com base nos pontos de corte propostos por COLE et al. A AF foi avaliada através do questionário de Baecke e a AptF com quatro testes da bateria Fitnessgram. O ESE foi estimado a partir do acesso aos escalões atribuídos pela Ação Social Escolar e a maturação biológica a partir do "offset" maturacional. A análise estatística foi efetuada nos "softwares" Pepi versão 4.0 e SPSS 18.0. O nível de significância foi mantido em 5%. Seis por cento dos alunos eram obesos e 19,5% tinham sobrepeso; meninos e meninas têm prevalências semelhantes de sobrepeso e obesidade. Os níveis médios de AF foram baixos a moderados independentemente do sexo ou "status" ponderal. Os meninos eram mais ativos que as meninas (p < 0,001), mas não se registraram diferenças significativas entre os alunos com obesidade e sobrepeso e os normoponderais. Na AptF, um número superior a 50%, foi considerado inapto, i.e, não obtiveram taxas de sucesso em todos os testes. Os alunos com sobrepeso e obesidade foram mais inaptos. Alunos com "offset" maturacional mais avançado e os mais novos tinham mais chances de ter sobrepeso e obesidade, mas não houve relação significativa entre o ESE e o "status" ponderal. Concluímos que os jovens Tirsenses apresentam prevalências de obesidade e sobrepeso elevadas, são relativamente pouco ativos e, em grande medida, fisicamente inaptos. The aim of this study was to relate physical activity, physical fitness, maturation and socioeconomic status with the prevalence of ponderal risk in adolescents. This was a transversal study made in the Council of Santo Tirso in the north of Portugal. The sample consisted of 961students (463 boys and 498 girls), aged 11 to 18. Body mass index was used to establish ponderal status based on the cut points from COLE et al. Physical activity was evaluated by Baecke's questionnaire and physical fitness with four tests from Fitnessgram battery. Socioeconomic status was ranked according to the grades assigned by state school subsidies, while biological maturation estimation was based on maturational offset. Software programs Pepi version 4.0 and SPSS 18.0 were used for statistical analysis. The level of significance was kept in 5%. Six percent of the target students were obese and 19.5% had overweight. The prevalences of overweight and obesity were similar between genders. The medium levels of physical activity were low or moderate, independent of gender or ponderal status. Boys were more active than girls (p < 0.001) but no significant differences were found between the students with obesity and overweight and normoponderal ones. On what concerns physical fitness, a high percentage of students (above 50%) were considered inapt and failed the tests. Students suffering from overweight and obesity were clearly more inapt. Students with more advanced maturational offset as well as the youngest ones were more likely to present overweight and obesity but no meaningful relationship was found between socioeconomic position and ponderal status. We concluded that young students from S. Tirso had high prevalences of obesity and overweight, were relatively inactive and largely physically unfit

Obesidade e sobrepeso em adolescentes: relação com atividade física, aptidão física, maturação biológica e "status" socioeconômico